Bleaching process and means



Patented Apr. 14, 1925.

WILLIAM O; KAISER, OF BURLINGTON, IOWA.

. BLEACHING PROCESS AND MEANS.

80 Drawing.

To all whom it may com-em." 1

Be-it known that I, WILLIAM C. KAISER, a citizen of the United States, residing at Burlington, in the county of Des Moines and State of Iowa, have invented certain new and useful Improvements in Bleaching Processes and Means; and I hereby declare that the following is a full, clear and exact description-thereof, reference being had to the accompanying drawings which form part of this specification.

This invention includes a novel method of or process for removing stains from material, for instance, fabrics and the like, and for bleaching such material; and also novel means for carrying out such process.

The process in brief consists in placing the fabric between sheets of material previously impregnated with different chemicals which react in the presence of water or other suitable liquid, and applying water to the sheets.

The novel means used in carrying out the process includessheets of suitable material respectively impregnated with suitable chemicals which 'will react when brought in contact with water or and which sheets may be stored indefinitely until it is desired to use them.-

In carrying out my invention a sheet of suitable material such as bibulous paper is passed through a preferably concentrated solution of a suitable chemical or mixture of chemicals (for an example say oxalic acid,) and then dried so as to evaporate the solvent or volatile constituents of the solution and leave. the chemical disseminated throughout the material.

Similarly other sheets of suitable mate 'rial are passed through another preferably concentrated solution of a suitable chemical or mixture of chemicals (for example say sodium bisulphite) which will react with the chemicals contained in the first mentioned sheets in the presence of water or other suitable liquid. In this manner a definite amount of the desired chemicals are stored in the dried sheets and the latter may be kept in a dry place until it is desired to use them.

In impregnating the sheets any suitable solvent may be used for the chemicals or the chemical mixtures thereof and the chemicals or mixtures thereof may be either hot or cold when applied to the sheets, depending other suitable liquid Application filed July 10, 192}. Serial No. 725,282.

upon the chemicals used. In carrying out the process the object to be treated is placed between a sheet impregnated with one chemical and a sheet impregnated with the other chemical; and then water, or other suitable liquid which--will caus'e reaction to take place between the chemicals in the contiguous sheets, is applied thereto.

For example, if it is desired to remove stains from or bleach piece of fabric; or the like; the fabric is pl aced between a sheet of material impregnated with oxalic acid, and a sheet of material impregnated with sodium bisulphite, the sheet impregnated with oxalic acid being preferably then on top. A small amoun of water, either cold or warm, is then app led to the top sheet of material and the oxalic acid therein will be dissolved and liberated therefrom and the acid solution will pass through the fabric into the sheet impregnated with sodium bisulphite, and react with the sodium bisuL- phite in the lower sheet liberating SO gas which bleaches the fabric.

While I preferably use sheets of blotting paper as the container for the chemicals, other porous, absorbent, or bibulous materials may be used; such as cotton Wool, felt, asbestos board, asbestos wo ol, or other suitable materials which will absorb the chemicals used in the process.

The sheets of impregnated material may be stored in suitable dry containers until it is desired to use them.

To remove ink stains from fabrics or the like, a solution of calcium sulphite may be used in the place of sodium bisulphite solution.

The invention is not limited to reactions between oxalic acid on the one part, and so- .the results desired and the nature of I dium or calcium bisulphite on the other above and below the fabric, and warm water added.

While I have referred to sheets I do not thereby intend to limit my invention to more sheets of material but to include thereby other usable bodies of the sheet material.

I claim:

1. The roccss consisting in placing the object to )0 treated between sheets of material impregnated respectively with different chemicals which will react in the presence of a suitable liquid to bleach the object; and then subjecting the same to such liquid.

.2. The process consisting in placing the object to be treated between sheets of material respectively impregnated with oxalicacid and sodium bisulphite and then applying to the sheets a liquid whereby said chemicals are caused to react.

3. A bleaching process for fabrics consisting, in placing the fabric between a sheet of material impregnated with a chemical; and a second sheet of material llH- pregnated with a chemical which will react with the chemical in the first sheet to bleach the fabric; and then subjectin the sheets and materials to a liquid which will cause the chemical in the sheets to react.

4. A bleaching process, consisting in impregnating a sheet of bibulous material with a chemical; impregnating a second sheet of bibulous material with a chemical which I to the sheets.

5. The herein described bleaching process, consisting 1n impregnating an absorbent sheet with a chemical and drying ing in impregnating an absorbent sheet material with oxalic acid and permitting the sheet to dry; impregnating a second sheet of such material with sodium bisulphite and permitting it to dry; lacing the object to be treated between said sheets while in the dry state; and applying water to the sheets to cause the chemicals to react.

7. As an article of manufacture for use in bleaching sheets of material impregnated with chemicals which will react in the presence of a suitable liquid to bleach the object. 7

8. A. means for use in bleaching comprisinf, a sheet of material impregnated with a chemical; and a second sheet of material impregnated with a chemical which. will reactwith the chemical in the first sheet to bleach an object when the sheets are wettcd with a liquid which will cause the chemicals in the sheets to react.

9. A means for use in bleaching; comprising sheets of bibulous material respectively impregnated with oxalic acid, and with sodium bisulphite. V

10. As an article of manufacture for use .in bleaching fabrics a sheet of absorbent material impregnated with oxalic acid.

In testimony that I claim the foregoing as my own I aflix my signature.

WILLIAM O. KAISER. 

